Roto-tiller



FIG. 1 is a front perspective view of a roto-tiller showing our new design, it being understood that the broken lines are for illustrative purposes only;

FIG. 2 is an enlarged side elevational view thereof;

FIG. 3 is an enlarged front elevational view thereof;

FIG. 4 is an enlarged side elevational view thereof opposite to that shown in FIG. 2; and

FIG. 5 is a greatly enlarged rear elevational view thereof.

The handle bars have been broken away in the middle in FIGS. 2, 3, 4 and 5 for convenience of illustration. 

The ornamental design for rotor-tiller, substantially as shown and described. 